The Murphy Builders Site

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Date: Sat, 10 Jan 1998 15:50:00 -0500
From: Wray Thompson <wrayt@ibm.net>
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To: Murphy Aviation <mursales@murphyair.com>
CC: rebelmail <murphy-rebel@dcsol.com>
Subject: Wing skin to tank skin
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Hi
When it comes to the instructions for attaching the wing skins to the
tank skins my instructions are a bit confusing. The instructions for
the top skin seem to indicate that all attachments takes place outside
the tank. ie the wing skin is not sandwiched between the tank skin and
the rib. The instructions for the bottom have the wing
skin sandwiched. I have the same 1" of free board of the tank skin out
side the last tank rib on top and bottom. It would appear that if I use
a rivet pitch of about 3/4" and offset 2 rows of rivets out side the
tank that I can maintain 5/16" edge distance and at least 4 rivet
diameters between rivets.
My question is - will 2 rows of rivets parallel but equally offset from
each other with a pitch of 3/4" be sufficient to attach the wing skin to
the tank skin, out board of the tank? or would even fewer be sufficient?

I would prefer to attach the tank skins and test for leaks without
having to permanently attach the main wing skins until after the tanks
are tested.
I would appreciate your insight
many thanks ...Wray Thompson R306

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From: "Charles Skorupa" <chucks@gte.net>
To: <murphy-rebel@dcsol.com>
Subject: Fw: Wing skin to tank skin
Date: Sun, 11 Jan 1998 22:54:18 -0800
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I sent this reply to Wray, but somehow missed the mail group. Sorry.

- Chuck -
-----Original Message-----
From: Charles Skorupa <chucks@gte.net>
To: Wray Thompson <wrayt@ibm.net>
Date: Sunday, January 11, 1998 11:50 AM
Subject: Re: Wing skin to tank skin

Hi Wray,
Edge distance was a problem for me on the skin aft of the tank. I started
with the Rebel wing and converted to an Elite wing. The earlier
instructions sandwiched the skin on top and the rivet spacings were ok for
that installation. When I converted to the much superior method of
installing the top skin after the tank skin, the holes I drilled earlier
were a little shy of edge distance. I solved the problem by bending a
return flange on the skin which nearly butts against the aft surface of the
tank. Some of the rivets are close to the radius of the bend, but I
maintained more material to help the shear load. There is another complete
line of rivets aft of this to also transfer the loads between the tank skin
and the top skin.

- Chuck Skorupa -
Rebel Elite Taildragger #500
-----Original Message-----
From: Wray Thompson <wrayt@ibm.net>
To: Murphy Aviation <mursales@murphyair.com>
Cc: rebelmail <murphy-rebel@dcsol.com>
Date: Saturday, January 10, 1998 1:02 PM
Subject: Wing skin to tank skin

Hi
When it comes to the instructions for attaching the wing skins to the
tank skins my instructions are a bit confusing. The instructions for
the top skin seem to indicate that all attachments takes place outside
the tank. ie the wing skin is not sandwiched between the tank skin and
the rib. The instructions for the bottom have the wing
skin sandwiched. I have the same 1" of free board of the tank skin out
side the last tank rib on top and bottom. It would appear that if I use
a rivet pitch of about 3/4" and offset 2 rows of rivets out side the
tank that I can maintain 5/16" edge distance and at least 4 rivet
diameters between rivets.
My question is - will 2 rows of rivets parallel but equally offset from
each other with a pitch of 3/4" be sufficient to attach the wing skin to
the tank skin, out board of the tank? or would even fewer be sufficient?

I would prefer to attach the tank skins and test for leaks without
having to permanently attach the main wing skins until after the tanks
are tested.
I would appreciate your insight
many thanks ...Wray Thompson R306